US20220216427A1 - Organic electroluminescent element - Google Patents

Organic electroluminescent element Download PDF

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US20220216427A1
US20220216427A1 US17/604,087 US202017604087A US2022216427A1 US 20220216427 A1 US20220216427 A1 US 20220216427A1 US 202017604087 A US202017604087 A US 202017604087A US 2022216427 A1 US2022216427 A1 US 2022216427A1
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carbon atoms
host
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organic electroluminescent
electroluminescent device
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Junya Ogawa
Yuji Ikenaga
Kazunari Yoshida
Ikumi KITAHARA
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Nippon Steel Chemical and Materials Co Ltd
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    • H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
    • H10K50/13—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light comprising stacked EL layers within one EL unit

Definitions

  • the present invention relates to an organic electroluminescent element (also referred to as an organic EL device). Specifically, the present invention relates to an organic EL device using a material for an organic electroluminescent device comprises an indolocarbazole compound.
  • PTL 1 discloses an organic EL device using a triplet-triplet fusion (TTF) mechanism which is one of delayed fluorescence mechanisms.
  • TTF triplet-triplet fusion
  • the efficiency thereof is lower than that of the phosphorescent organic EL device, further improvement in efficiency is required.
  • an organic EL device in which a thermally activated delayed fluorescence (TADF) mechanism is used is disclosed.
  • TADF thermally activated delayed fluorescence
  • the internal quantum efficiency can be increased to 100%.
  • further improvement in lifespan characteristics is required similarly to the phosphorescent device.
  • An object of the present invention is to provide an organic EL device having a low drive voltage, high efficiency, and high drive stability.
  • the present inventors have conducted extensive studies, and as a result, they have found that a specific indolocarbazole compound may be used as a first host to obtain an organic EL device exhibiting excellent characteristics, thus leading to realization of the present invention.
  • the present invention is an organic EL device including: one or more light emitting layers between an anode and a cathode facing each other, in which at least one light emitting layer contains a first host selected from compounds represented by General Formula (1) below and a second host selected from compounds represented by General Formula (2) or (3) below.
  • a ring A is a heterocyclic ring represented by Formula (1a) and condensed with an adjacent ring at an arbitrary position.
  • R's are independently hydrogen, an aliphatic hydrocarbon group having 1 to 10 carbon atoms, an aromatic hydrocarbon group having 6 to 10 carbon atoms, or an aromatic heterocyclic group having 3 to 12 carbon atoms
  • L 1 to L 3 are independently a direct bond, an aromatic hydrocarbon group having 6 to 10 carbon atoms, or an aromatic heterocyclic group having 3 to 12 carbon atoms.
  • B 1 to B 3 independently represent a direct bond or a biphenyldiyl group represented by Formula (1b), and at least one of B 1 to B 3 is the biphenyldiyl group.
  • a, b, c, d, and e each independently represent an integer of 0 to 3
  • s, t, and u each independently represent an integer of 1 and 2.
  • R's independently represent hydrogen, an alkyl group having 1 to 20 carbon atoms, an acyl group having 2 to 20 carbon atoms, an alkoxy group having 2 to 20 carbon atoms, an aromatic hydrocarbon group having 6 to 24 carbon atoms, or an aromatic heterocyclic group having 3 to 16 carbon atoms, but are not a carbazole ring group.
  • B 4 's are independently hydrogen, an aromatic hydrocarbon group having 6 to 24 carbon atoms, or an aromatic heterocyclic group having 3 to 16 carbon atoms, and the aromatic hydrocarbon group or the aromatic heterocyclic group may have a substituent.
  • j represents an integer of 1 to 6
  • X's independently represent N, C—R′, or C—
  • each R′ independently represents hydrogen, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, and a diarylamino group having 12 to 44 carbon atoms.
  • f, g, h, and i independently represent an integer of 1 to 3.
  • a ring C is a heterocyclic group represented by Formula (3a)
  • L 4 and L 5 are independently a direct bond, an aromatic hydrocarbon group having 6 to 10 carbon atoms, or an aromatic heterocyclic group having 3 to 16 carbon atoms
  • B 5 and B 6 are a direct bond or an aromatic hydrocarbon group having 6 to 22 carbon atoms
  • R's are independently hydrogen, an aromatic hydrocarbon group having 6 to 10 carbon atoms, an aromatic heterocyclic group having 3 to 16 carbon atoms, an alkyl group having 1 to 10 carbon atoms, or a cycloalkyl group having 3 to 11 carbon atoms
  • Y represents O or S.
  • n and n are numbers of substitutions and represent integers of 1 to 3.
  • p and q are numbers of repetitions and are each independently integers of 1 to 4.
  • B 3 is a biphenyldiyl group represented by Formula (1b), or a, b, and c are 0.
  • j is an integer of 1 to 3, or X's are N or C—H.
  • Formula (3a) is Formula (4) or (5) below.
  • L 4 and B 5 are a direct bond
  • B 6 is an aromatic hydrocarbon group represented by Formula (6) below
  • L 5 is an aromatic heterocyclic group represented by Formula (7) below.
  • General Formula (1) is any of Formulae (8) to (11) below.
  • a proportion of the first host is suitably greater than 20 wt % and less than 55 wt % based on the total amount of the first host and the second host.
  • the above-described organic electroluminescent device contain a luminescent dopant material together with the hosts in the light emitting layer.
  • the luminescent dopant material is preferably an organic metal complex containing at least one metal selected from the group consisting of ruthenium, rhodium, palladium, silver, rhenium, osmium, iridium, platinum, and gold, or a thermally activated delayed fluorescent dopant material.
  • a hole-blocking layer may be provided adjacent to the light emitting layer, and the compound represented by General Formula (1) may be contained in the hole-blocking layer.
  • the present invention is a method for producing an organic electroluminescent device, the method including: a step of mixing a first host with a second host to prepare a premixture and then vapor-depositing the host material containing the hosts to form a light emitting layer when producing the above-described organic electroluminescent device.
  • a difference in 50% weight reduction temperature between the first host and the second host is preferably within 20° C.
  • an indolocarbazole compound which is used in the present invention and to which a specific aromatic heterocyclic ring is bonded has an ortho-linked biphenyldiyl group represented by Formula (1b).
  • the injection and transport capability of materials for both charges used in an organic layer greatly depends on energy levels of molecular orbitals of materials and the extent of intermolecular interactions.
  • indolocarbazole compounds to which specific aromatic heterocyclic rings are bonded have a particularly high electron injection and transport capability, close proximity of the indolocarbazole molecules can be inhibited due to steric hindrance effects of biphenyldiyl groups.
  • changing bonding sites or types of substituents of biphenyldiyl groups allows a high level of control of intermolecular interactions of molecular orbitals which greatly contribute to electron injection and transport with respect to the light emitting layer.
  • the carbazole compounds represented by General Formulae (2) and (3), and dibenzofuran and dibenzothiophene compounds have a particularly high hole injection and transport capability, therefore allowing a high level of control of hole injection and transport properties by changing a bonding site of a carbazole ring or the number and types of substituents on this skeleton.
  • a delayed fluorescent EL device or a phosphorescent EL device has a sufficiently high lowest excited triplet energy to confine an excitation energy generated in a light emitting layer, there is no leakage of energy from the light emitting layer, and a low voltage, a high efficiency, and long lifespan can be achieved.
  • FIG. 1 is a schematic cross-sectional view illustrating an example of an organic EL device.
  • An organic electroluminescent device of the present invention includes one or more light emitting layers between an anode and a cathode facing each other, and at least one light emitting layer contains a first host and a second host.
  • the light emitting layer preferably includes a vapor deposition layer containing a first host, a second host, and a luminescent dopant material. This vapor deposition layer can be produced through vacuum deposition.
  • This organic EL device of the present invention has an organic layer including a plurality of layers between an anode and a cathode facing each other. At least one of the plurality of layers is a light emitting layer, and there may be a plurality of light emitting layers.
  • the first host is a compound represented by General Formula (1)
  • a second host is a compound represented by General Formula (2) or (3).
  • a ring A is a heterocyclic ring represented by Formula (1a) and condensed with an adjacent ring at an arbitrary position.
  • R's independently represent hydrogen, an aliphatic hydrocarbon group having 1 to 10 carbon atoms, an aromatic hydrocarbon group having 6 to 10 carbon atoms, or an aromatic heterocyclic group having 3 to 12 carbon atoms.
  • An aliphatic hydrocarbon group having 1 to 8 carbon atoms, a phenyl group, or an aromatic heterocyclic group having 3 to 9 carbon atoms is preferable.
  • An aliphatic hydrocarbon group having 1 to 6 carbon atoms, a phenyl group, or an aromatic heterocyclic group having 3 to 6 carbon atoms is more preferable.
  • aliphatic hydrocarbon group having 1 to 10 carbon atoms include methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, and decyl groups.
  • An alkyl group having 1 to 4 carbon atoms is preferable.
  • aromatic hydrocarbon group having 6 to 10 carbon atoms or aromatic heterocyclic group having 3 to 12 carbon atoms include aromatic groups formed by removing one H from benzene, naphthalene, pyridine, pyrimidine, triazine, thiophene, isothiazole, thiazole, pyridazine, pyrrole, pyrazole, imidazole, triazole, thiadiazole, pyrazine, furan, isoxazole, oxazole, oxadiazole, quinoline, isoquinoline, quinoxaline, quinazoline, oxadiazole, thiadiazole, benzotriazine, phthalazine, tetrazole, indole, benzofuran, benzothiophene, benzoxazole, benzothiazole, indazole, benzimidazole, benzotriazole, benzoisothiazole,
  • Preferred examples thereof include aromatic groups formed from benzene, pyridine, pyrimidine, triazine, thiophene, isothiazole, thiazole, pyridazine, pyrrole, pyrazole, imidazole, triazole, thiadiazole, pyrazine, furan, isoxazole, oxazole, oxadiazole, quinoline, isoquinoline, quinoxaline, quinazoline, oxadiazole, thiadiazole, benzotriazine, phthalazine, tetrazole, indole, benzofuran, benzothiophene, benzoxazole, benzothiazole, indazole, benzimidazole, benzotriazole, benzoisothiazole, or benzothiadiazole.
  • More preferred examples thereof include aromatic groups formed from benzene, pyridine, pyrimidine, triazine, thiophene, isothiazole, triazole, pyridazine, pyrrole, pyrazole, imidazole, triazole, thiadiazole, pyrazine, furan, isoxazole, oxazole, or oxadiazole.
  • L 1 , L 2 , and L 3 are independently a direct bond, an aromatic hydrocarbon group having 6 to 10 carbon atoms, or an aromatic heterocyclic group having 3 to 12 carbon atoms.
  • Preferred examples of aromatic hydrocarbon groups or aromatic heterocyclic groups are the same as those in the case where R's are these groups except that these groups are divalent groups.
  • B 1 , B 2 , and B 3 independently represent a direct bond or a group represented by Formula (1b), and at least one of B 1 to B 3 is a group represented by Formula (1b).
  • B 3 is preferably the group represented by Formula (1b).
  • a, b, c, d, and e represent numbers of substitutions and each independently represent an integer of 0 to 3, and an integer of 0 or 1 is preferable.
  • a, b, and c are preferably 0.
  • s, t, u represent numbers of repetitions and each independently represent an integer of 1 and 2, and 1 is preferable.
  • General Formula (1) Preferred aspects of compounds represented by General Formula (1) are compounds represented by any of General Formulae (8) to (11) above.
  • symbols shared by those in General Formula (1) have the same meaning.
  • B 4 's are independently hydrogen, an aromatic hydrocarbon group having 6 to 24 carbon atoms, or an aromatic heterocyclic group having 3 to 16 carbon atoms. It is preferable that B 4 's be independently hydrogen, an aromatic hydrocarbon group having 6 to 12 carbon atoms, or an aromatic heterocyclic group having 4 to 14 carbon atoms, and it is more preferable that B 4 's be independently an aromatic hydrocarbon group having 6 to 10 carbon atoms.
  • aromatic hydrocarbon group having 6 to 24 carbon atoms or aromatic heterocyclic group having 3 to 16 carbon atoms include aromatic groups formed by removing one H from benzene, naphthalene, pyridine, pyrimidine, triazine, thiophene, isothiazole, thiazole, pyridazine, pyrrole, pyrazole, imidazole, triazole, thiadiazole, pyrazine, furan, isoxazole, oxazole, oxadiazole, quinoline, isoquinoline, quinoxaline, quinazoline, oxadiazole, thiadiazole, benzotriazine, phthalazine, tetrazole, indole, benzofuran, benzothiophene, benzoxazole, benzothiazole, indazole, benzimidazole, benzotriazole, benzoisothiazole,
  • Preferred examples thereof include aromatic groups formed from benzene, pyridine, pyrimidine, triazine, thiophene, isothiazole, thiazole, pyridazine, pyrrole, pyrazole, imidazole, triazole, thiadiazole, pyrazine, furan, isoxazole, oxazole, oxadiazole, quinoline, isoquinoline, quinoxaline, quinazoline, oxadiazole, thiadiazole, benzotriazine, phthalazine, tetrazole, indole, benzofuran, benzothiophene, benzoxazole, benzothiazole, indazole, benzimidazole, benzotriazole, benzoisothiazole, or benzothiadiazole.
  • More preferred examples thereof include aromatic groups formed from benzene, pyridine, pyrimidine, triazine, thiophene, isothiazole, thiazole, pyridazine, pyrrole, pyrazole, imidazole, triazole, thiadiazole, pyrazine, furan, isoxazole, oxazole, or oxadiazole.
  • j represents a number of repetitions and represents an integer of 1 to 6 and preferably an integer of 1 to 3.
  • repeating units thereof may be the same as or different from each other.
  • R's independently represent hydrogen, an alkyl group having 1 to 20 carbon atoms, an acyl group having 2 to 20 carbon atoms, an alkoxy group having 2 to 20 carbon atoms, an aromatic hydrocarbon group having 6 to 24 carbon atoms, or an aromatic heterocyclic group having 3 to 16 carbon atoms, but are not a carbazole ring group. Hydrogen, an aromatic hydrocarbon group having 6 to 24 carbon atoms, or an aromatic heterocyclic group having 3 to 16 carbon atoms is preferable.
  • f, g, h, and i represent numbers of substitutions and each independently represent an integer of 1 to 3, and an integer of 1 or 2 is preferable.
  • X's independently represent N, C—R′, or C—, and N or C—H is preferable. More preferably, all X's are C—H, or C—H and N.
  • R′ represents hydrogen, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, or a diarylamino group having 12 to 44 carbon atoms.
  • a ring C is a heterocyclic group represented by Formula (3a), and is preferably a heterocyclic group represented by Formula (4) or (5).
  • Y represents O or S.
  • L 4 and L 5 are independently a direct bond, an aromatic hydrocarbon group having 6 to 10 carbon atoms, or an aromatic heterocyclic group having 3 to 16 carbon atoms.
  • An aromatic hydrocarbon group having 6 to 10 carbon atoms or an aromatic heterocyclic group represented by Formula (7) is preferable.
  • B 5 and B 6 are a direct bond or an aromatic hydrocarbon group having 6 to 22 carbon atoms.
  • An aromatic hydrocarbon group represented by Formula (6) is preferable.
  • R's each independently represent hydrogen, an aromatic hydrocarbon group having 6 to 10 carbon atoms, an aromatic heterocyclic group having 3 to 16 carbon atoms, an alkyl group having 1 to 10 carbon atoms, or a cycloalkyl group having 3 to 11 carbon atoms.
  • the aromatic hydrocarbon group, the aromatic heterocyclic group, and the like may have a substituent unless otherwise specified.
  • n and n are numbers of substitutions and represent integers of 1 to 3, and are preferably integers of 1 and 2.
  • p and q are numbers of repetitions and are each independently integers of 1 to 4 and preferably integers of 1 and 2.
  • An excellent organic EL device can be provided using a first host selected from the compounds represented by General Formula (1) and a second host selected from the compounds represented by General Formulae (2) and (3) as host materials for a light emitting layer.
  • the first host and the second host can be used by being vapor-deposited from different vapor deposition sources.
  • a premixture be prepared by premixing the first host and the second host before vapor deposition and these be vapor-deposited simultaneously from one vapor deposition source to form a light emitting layer.
  • a luminescent dopant material required for forming a light emitting layer or other hosts used as necessary may be mixed with this premixture.
  • the vapor deposition is preferably performed from different vapor deposition sources.
  • the proportion of the first host in the total amount of the first host and the second host may be 20% to 60%, and is preferably higher than 20% and lower than 55% and more preferably 40% to 50%.
  • FIG. 1 is a cross-sectional view illustrating a structural example of a general organic EL device used in the present invention.
  • 1 represents a substrate
  • 2 represents an anode
  • 3 represents a hole injection layer
  • 4 represents a hole transport layer
  • 5 represents a light emitting layer
  • 6 represents an electron transport layer
  • 7 represents a cathode.
  • the organic EL device of the present invention may have an exciton-blocking layer adjacent to the light emitting layer or may have an electron-blocking layer between the light emitting layer and the hole injection layer.
  • the exciton-blocking layer can be inserted into the light emitting layer on any position on the cathode side or an anode side and can be inserted into both sides at the same time.
  • the organic EL device of the present invention has an anode, a light emitting layer, and a cathode as essential layers. However, it is preferable that the organic EL device of the present invention have a hole injection/transport layer and an electron injection/transport layer in addition to the essential layers and further have a hole-blocking layer between the light emitting layer and the electron injection/transport layer.
  • the hole injection/transport layer means either or both of a hole injection layer and a hole transport layer
  • the electron injection/transport layer means either or both of an electron injection layer and an electron transport layer.
  • a structure opposite to that of FIG. 1 can also be used, that is, a cathode 7 , an electron transport layer 6 , a light emitting layer 5 , a hole transport layer 4 , and an anode 2 are laminated on a substrate 1 in this order. Even in this case, layers can be added or omitted as necessary.
  • the organic EL device of the present invention is preferably supported by a substrate.
  • a substrate is not particularly limited as long as it is conventionally used in organic EL devices, and a substrate made of glass, transparent plastic, quartz, or the like can be used.
  • an anode in an organic EL device metals, alloys, electrically conductive compounds, or materials composed of a mixture thereof which have a large work function (4 eV or more) are preferably used.
  • electrode materials include metals such as Au and conductive transparent materials such as Cul, indium tin oxide (ITO), SnO 2 , and ZnO.
  • amorphous materials such as IDIXO (In 2 O 3 —ZnO) capable of producing a transparent conductive film may be used.
  • a thin film may be formed through a method such as vapor deposition or sputtering of these electrode materials to form a pattern having a desired shape through a photolithographic method.
  • a pattern may be formed using a mask having a desired shape during vapor-depositing or sputtering of the above-described electrode materials.
  • wet film formation methods such as a printing method or a coating method can also be used.
  • light emission is taken out from this anode, it is desirable to increase the transmittance to more than 10% and it is preferable to set the sheet resistance of an anode to several hundred Q/square or less.
  • the film thickness also depends on materials, but is selected from a range of usually 10 to 1,000 nm and preferably 10 to 200 nm.
  • cathode materials electron injecting metals
  • alloys electrically conductive compounds, or materials composed of a mixture thereof which have a small work function (4 eV or less)
  • materials include sodium, sodium-potassium alloys, magnesium, lithium, magnesium-copper mixtures, magnesium-silver mixtures, magnesium-aluminum mixtures, magnesium-indium mixtures, aluminum-aluminum oxide (Al 2 O 3 ) mixtures, indium, lithium-aluminum mixtures, and rare earth metals.
  • a mixture of an electron injecting metal and a secondary metal which is a stable metal having a larger work function than the electron injecting metal for example, a magnesium-silver mixture, a magnesium-aluminum mixture, a magnesium-indium mixture, an aluminum-aluminum oxide mixture, a lithium-aluminum mixture, or aluminum is suitable from the viewpoints of electron injecting properties and durability against oxidation.
  • a cathode can be produced by forming a thin film through a method such as vapor deposition or sputtering of these cathode materials.
  • the sheet resistance of a cathode is preferably several hundred Q/square or less, and the film thickness is selected from a range of usually 10 nm to 5 ⁇ m and preferably 50 to 200 nm. It is preferable that the luminance be improved by making either an anode or a cathode of an organic EL device be transparent or translucent to allow emitted light to be transmitted therethrough.
  • a conductive transparent material exemplified in the description of the anode can be formed thereon to produce a transparent or translucent cathode.
  • a device in which both an anode and a cathode are transparent can be produced.
  • a light emitting layer is a layer emitting light after production of excitons due to recombination of holes and electrons respectively injected from an anode and a cathode and contains an organic luminescent dopant material and a host material.
  • the first host represented by General Formula (1) and the second host represented by General Formula (2) or (3) are used as a host material in the light emitting layer. Furthermore, one kind or plural kinds of well-known host materials may be used in combination, and it is preferable that the amount used be 50 wt % or less and preferably 25 wt % or less based on the total amount of the host materials. In addition, one kind or two or more kinds of the first host represented by General Formula (1) and the second host represented by General Formula (2) or (3) may be used.
  • the first host and the second host can be vapor-deposited from different vapor deposition sources.
  • a premixture can be prepared by premixing the first host and the second host before vapor deposition and vapor-deposited simultaneously from one vapor deposition source.
  • the difference in 50% weight reduction temperature (T 50 ) is desirably small in order to produce an organic EL device having favorable characteristics with good reproducibility.
  • the 50% weight reduction temperature is a temperature when the weight is reduced by 50% when the temperature is raised from room temperature to 550° C. at a rate of 10° C. per minute in TG-DTA measurement under nitrogen stream decompression (50 Pa). It is thought that vaporization due to evaporation or sublimation occurs most actively in the vicinity of this temperature range.
  • the difference in 50% weight reduction temperature between the first host and the second host is preferably within 20° C. and more preferably within 15° C.
  • a well-known method such as pulverizing and mixing can be employed, and it is desirable that the mixing be performed as uniformly as possible.
  • a phosphorescent dopant containing an organic metal complex containing at least one metal selected from the group consisting of ruthenium, rhodium, palladium, silver, rhenium, osmium, iridium, platinum, and gold may be used.
  • iridium complexes disclosed in J. Am. Chem. Soc. 2001, 123, 4304 or Japanese Translation of PCT Application No. 2013-53051 are suitably used, but the present invention is not limited thereto.
  • Only one kind of a phosphorescent dopant material may be contained in a light emitting layer, or two or more kinds of phosphorescent dopant materials may be contained therein.
  • the content of a phosphorescent dopant material with respect to a host material is preferably 0.1 to 30 wt % and more preferably 1 to 20 wt %.
  • the phosphorescent dopant material is not particularly limited, but specific examples thereof include the following.
  • the fluorescent dopant is not particularly limited, but examples thereof include benzoxazole derivatives, benzothiazole derivatives, benzoimidazole derivatives, styrylbenzene derivatives, polyphenyl derivatives, diphenylbutadiene derivatives, tetraphenylbutadiene derivatives, naphthalimide derivatives, coumarin derivatives, condensed aromatic compounds, perinone derivatives, oxadiazole derivatives, oxazine derivatives, aldazine derivatives, pyrrolidine derivatives, cyclopentadiene derivatives, bisstyrylanthracene derivatives, quinacridone derivatives, pyrrolopyridine derivatives, thiadiazolopyridine derivatives, styrylamine derivatives, diketopyrrolopyrrole derivatives, aromatic dimethylidyne compounds, various metal complexes typified
  • Preferred examples thereof include condensed aromatic derivatives, styryl derivatives, diketopyrrolopyrrole derivatives, oxazine derivatives, pyrromethene metal complexes, transition metal complexes, and lanthanoid complexes, and more preferred examples thereof include naphthalene, pyrene, chrysene, triphenylene, benzo[c]phenanthrene, benzo[a]anthracene, pentacene, perylene, fluoranthene, acenaphthofluoranthene, dibenzo[a,j]anthracene, dibenzo[a,h]anthracene, benzo [a] naphthalene, hexacene, naphth[2,1-f]isoquinoline, ⁇ -naphthaphenanthridin, phenanthrooxazole, quinolino[6,5-f]quinoline, and benzothiophant
  • a fluorescent dopant material Only one kind of a fluorescent dopant material may be contained in a light emitting layer, or two or more kinds of phosphorescent dopant materials may be contained therein.
  • the content of a fluorescent dopant material with respect to a host material is preferably 0.1 to 20% and more preferably 1 to 10%.
  • thermally activated delayed fluorescent dopant is used as a luminescent dopant material
  • examples thereof include metal complexes such as a tin complex or a copper complex, indolocarbazole derivatives disclosed in WO2011/070963, cyanobenzene derivatives and carbazole derivatives disclosed in Nature 2012, 492, 234, and phenazine derivatives, oxadiazole derivatives, triazole derivatives, sulfone derivatives, phenoxazine derivatives, and acridine derivatives disclosed in Nature Photonics 2014, 8, 326.
  • the thermally activated delayed fluorescent dopant material is not particularly limited, but specific examples thereof include the following.
  • thermally activated delayed fluorescent dopant material Only one kind of a thermally activated delayed fluorescent dopant material may be contained in a light emitting layer, or two or more kinds of thermally activated delayed fluorescent dopant materials may be contained therein.
  • the thermally activated delayed fluorescent dopant may be used by being mixed with a phosphorescent dopant or a fluorescent dopant.
  • the content of a thermally activated delayed fluorescent dopant material with respect to a host material is preferably 0.1 to 50% and more preferably 1 to 30%.
  • An injection layer is a layer, such as a hole injection layer or an electron injection layer, provided between an electrode and an organic layer for reducing a drive voltage or improving luminance and may be present between an anode and a light emitting layer or a hole transport layer and between a cathode and a light emitting layer or an electron transport layer.
  • the injection layer can be provided as necessary.
  • a hole-blocking layer has a function of an electron transport layer in a broad sense and is made of a hole-blocking material which has a function of transporting electrons and a significantly low ability of transporting holes. By blocking holes while transporting electrons, the probability of recombining electrons and holes in a light emitting layer can be increased.
  • a well-known hole-blocking layer material can be used in a hole-blocking layer, but the compound represented by General Formula (1) is preferably contained in a hole-blocking layer.
  • An electron-blocking layer has a function of a hole transport layer in a broad sense. By blocking electrons while transporting holes, the probability of recombining electrons and holes in a light emitting layer can be increased.
  • a well-known electron-blocking layer material can be used as the electron-blocking layer material, and a hole transport layer material to be described below can be used as necessary.
  • the film thickness of an electron-blocking layer is preferably 3 to 100 nm and more preferably 5 to 30 nm.
  • An exciton-blocking layer is a layer for blocking excitons generated by recombination of holes and electrons in a light emitting layer from being diffused in a charge transport layer. When this exciton-blocking layer is inserted, excitons can be efficiently confined in a light emitting layer and the luminous efficiency of a device can be improved. In a case of a device in which two or more light emitting layers are adjacent, an exciton-blocking layer can be inserted between the two adjacent light emitting layers.
  • a well-known exciton-blocking layer material can be used as the exciton-blocking layer material.
  • Examples thereof include 1,3-dicarbazolylbenzene (mCP) and bis(2-methyl-8-quinolinolato)-4-phenylphenolato aluminum (III) (BAlq).
  • a hole transport layer is made of a hole transport material having a function of transporting holes, and a single hole transport layer or a plurality of hole transport layers can be provided.
  • hole transport material one which is either an organic substance or an inorganic substance having either a function of injecting or transporting holes or electron barrier properties may be used.
  • An arbitrary compound selected from conventionally well-known compounds can be used in a hole transport layer.
  • hole transport materials include porphyrin derivatives, arylamine derivatives, triazole derivatives, oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives, pyrazolone derivatives, phenylenediamine derivatives, arylamine derivatives, amino-substituted chalcone derivatives, oxazole derivatives, styrylanthracene derivatives, fluorenone derivatives, hydrazone derivatives, stilbene derivatives, silazane derivatives, aniline copolymers, and conductive polymer oligomers, and especially thiophene oligomers.
  • An electron transport layer is made of a material having a function of transporting electrons, and a single electron transport layer or a plurality of electron transport layers can be provided.
  • An electron transport material (which may also serve as a hole-blocking material) may have a function of transmitting electrons injected from a cathode to a light emitting layer.
  • An arbitrary compound selected from conventionally well-known compounds can be used in an electron transport layer, and examples thereof include polycyclic aromatic derivatives such as naphthalene, anthracene, and phenanthroline, tris(8-quinolinolato)aluminum (III) derivatives, phosphine oxide derivatives, nitro-substituted fluorene derivatives, diphenylquinone derivatives, thiopyran dioxide derivatives, carbodiimide, fluorenylidene methane derivatives, anthraquinodimethane, anthrone derivatives, bipyridine derivatives, quinoline derivatives, oxadiazole derivatives, benzoimidazole derivatives, benzothiazole derivatives, and indolocarbazole derivatives.
  • Each thin film was laminated on a glass substrate, on which an anode made of ITO and having a film thickness of 110 nm was formed, with a vacuum degree of 4.0 ⁇ 10 ⁇ 5 Pa through a vacuum vapor deposition method.
  • 25 nm thick HAT-CN was formed on the ITO as a hole injection layer, and then 30 nm thick NPD was formed thereon as a hole transport layer.
  • 10 nm thick HT-1 was formed thereon as an electron-blocking layer.
  • a compound 1-4 as a first host, a compound 2-4 as a second host, and Ir (ppy) 3 as a luminescent dopant were subjected to co-vapor deposition from different vapor deposition sources to form a light emitting layer having a thickness of 40 nm.
  • the co-vapor deposition was performed under the vapor deposition conditions where the concentration of Ir (ppy) 3 was 10 wt % and the weight ratio of the first host to the second host was 30:70.
  • 20 nm thick ET-1 was formed thereon as an electron transport layer.
  • 1 nm thick LiF was formed on the electron transport layer as an electron injection layer.
  • 70 nm thick Al was formed on the electron injection layer as a cathode to produce an organic EL device.
  • Organic EL devices were produced in the same manner as in Example 1 except that each compound shown in Tables 1 and 2 was used as a first host and a second host.
  • a first host and a second host were mixed with each other in advance to prepare a premixture and subjected to co-vapor deposition from one vapor deposition source.
  • Example 1 A first host (0.30 g) and a second host (0.70 g) in Example 1 were weighed and mixed with each other while being ground in a mortar to obtain a premixture. Organic EL devices were produced in the same manner as in Example 1 except that this premixture was used.
  • Evaluation results of the produced organic EL devices are shown in Tables 1 and 2.
  • the luminance, the drive voltage, and the luminous efficiency are values when the drive current is 20 mA/cm 2 and are initial characteristics.
  • LT70 is the time required for the initial luminance to attenuate to 70% and represents lifespan characteristics.
  • An organic EL device was produced in the same manner as in Example 1 except that a compound 1-1 was used alone as a host.
  • the thickness of a light emitting layer and the concentration of a luminescent dopant are the same as those in Example 1.
  • Organic EL devices were produced in the same manner as in Comparative Example 1 except that each compound shown in Table 3 was used alone as a host.
  • Organic EL devices were produced in the same manner as in Example 1 except that a compound A was used as a first host and a compound 2-5, a compound 2-48, a compound 3-8, or a compound 3-49 was used as a second host.
  • Organic EL devices were produced in the same manner as in Comparative Examples 16 to 19 except that a compound B was used as a first host.
  • Organic EL devices were produced in the same manner as in Comparative Examples 16 to 19 except that a compound C was used as a first host.
  • Each thin film was laminated on a glass substrate, on which an anode made of ITO and having a film thickness of 110 nm was formed, with a vacuum degree of 4.0 ⁇ 10 ⁇ 5 Pa through a vacuum vapor deposition method.
  • 25 nm thick HAT-CN was formed on the ITO as a hole injection layer, and then 45 nm thick NPD was formed thereon as a hole transport layer.
  • 10 nm thick HT-1 was formed thereon as an electron-blocking layer.
  • a compound 1-4 as a first host, a compound 2-4 as a second host, and Ir (piq) 2 acac as a luminescent dopant were subjected to co-vapor deposition from different vapor deposition sources to form a light emitting layer having a thickness of 40 nm.
  • the co-vapor deposition was performed under the vapor deposition condition where the concentration of Ir (piq) 2 acac was 6.0 wt %.
  • 37.5 nm thick ET-1 was formed thereon as an electron transport layer.
  • 1 nm thick LiF was formed on the electron transport layer as an electron injection layer.
  • 70 nm thick Al was formed on the electron injection layer as a cathode to produce an organic EL device.
  • Organic EL devices were produced in the same manner as in Example 52 except that each compound shown in Table 4 was used as a first host and a second host.
  • LT95 is the time required for the initial luminance to attenuate to 95% and represents lifespan characteristics.
  • An organic EL device was produced in the same manner as in Example 52 except that a compound 1-1 was used alone as a host.
  • the thickness of a light emitting layer and the concentration of a luminescent dopant are the same as those in Example 52.
  • Organic EL devices were produced in the same manner as in Comparative Example 28 except that each compound shown in Table 5 was used alone as a host.
  • Organic EL devices were produced in the same manner as in Example 52 except that a compound A was used as a first host and a compound 2-5, compound 2-48, a compound 3-8, or a compound 3-49 was used as a second host.
  • Organic EL devices were produced in the same manner as in Comparative Examples 42 to 45 except that a compound B was used as a first host.
  • Organic EL devices were produced in the same manner as in Comparative Examples 42 to 45 except that a compound C was used as a first host.
  • the organic EL device of the present invention has a low drive voltage, high efficiency, and high drive stability.

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